Hey A.,
I can relate to your situation. I went through something similar when my son started school. I really believe that she has probably seen some other kids fallout and she is testing you and looking for attention. I think the biggest thing is not to pay attention to it, unless you think there maybe something else going on. If you are sure she is just acting out and only does it for you for a period of time, then I would ignore the behavior. I'm sure it's embarrasing, but who cares, don't focus on other people focus on you and her. When my son would do that, he did it twice, where he just went into a crying, screaming fit and would not stop. My mom was convinced someone at the school was doing something to him, but I knew that was not the case. So what I did was just sat there and let him scream and cry it all out. I didn't yell, I didn't tell him to stop it, I just let him get it out. I put on a cartoon he liked (we were at home during his fit) and then all of a sudden he started to calm down. My husband started joking with him to make him laugh and then he stopped. When he calmed down, I talk to him very calmly and asked him if he was okay and what was wrong. I asked him if he was hurt, if he was hungry, and he gave all positive answers. He just sat in my arms for a little while and then he was back to normal. He wore his self out! So I think you have to treat each situation differently. If she has a fit when you drop her off, just drop her off and leave. Get daily reports from the provider to see if she was okay, and eventually she will stop. It's just something they go through, but she has to see that when she throws a fit, it's get her nothing. Good luck!